The label is one studio’s name for a stake-boost option that has since been imitated widely. Switching it on raises the bet by 25 percent, and in return the reels carry extra scatter symbols so that a natural feature trigger becomes roughly twice as likely on every spin, with the feature itself left unchanged. Because double chance slots present the toggle beside the stake selector rather than in a menu, many players activate it without fully registering the price increase. The new bet amount appears in the stake display immediately.